0.25+0.5=
3.2-0.22=
1-0.07=
5.54+4.6=
0.87+0.06=
4-2.6=
0.37+0.3=
2+0.1-2+0.1=
①3.6﹣2.8+7.4﹣7.2
②1.25×1.6×25
③÷4
④÷[(﹣)×]